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arm/xen: don't check for xen_initial_domain() in xen_create_contiguous_region

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It used to be that Linux enabled swiotlb-xen when running a dom0 on ARM.
Since f5079a9a2a "xen/arm: introduce XENFEAT_direct_mapped and
XENFEAT_not_direct_mapped", Linux detects whether to enable or disable
swiotlb-xen based on the new feature flags: XENFEAT_direct_mapped and
XENFEAT_not_direct_mapped.

However, there is still a leftover xen_initial_domain() check in
xen_create_contiguous_region. Remove the check as
xen_create_contiguous_region is only called by swiotlb-xen during
initialization. If xen_create_contiguous_region is called, we know Linux
is running 1:1 mapped so there is no need for additional checks.

Also update the in-code comment.

Signed-off-by: Stefano Stabellini <stefano.stabellini@xilinx.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
This commit is contained in:
Stefano Stabellini 2022-03-04 15:22:54 -08:00 committed by Christoph Hellwig
parent 0d5ffd9a25
commit 9bbe7a7fc1
1 changed files with 1 additions and 4 deletions
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5
arch/arm/xen/mm.c
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@ -122,10 +122,7 @@ int xen_create_contiguous_region(phys_addr_t pstart, unsigned int order,
unsigned int address_bits,
dma_addr_t *dma_handle)
{
if (!xen_initial_domain())
return -EINVAL;
/* we assume that dom0 is mapped 1:1 for now */
/* the domain is 1:1 mapped to use swiotlb-xen */
*dma_handle = pstart;
return 0;
}